Sewing-machine.



l. HEGGI'E. SEWING MACHINE. APPucATloN FILED APR.13.1915.

'Patented Apr. 16, 1918.' A

J. HEGGIE. SEWING MACHINE. AePucAloN man APR. 13. w15.

Patented Apr. 16, 1918.

2 SHEETS-SH EET 2.

/NVENTH JAMES HEGGIE, 0F CLYDEBANK, SCOTLAND, ASSIGNOR T0 THE TURIN GCOMPANY, A CORPORATION OF NEW JERSEY.

SEWING-MACHINE. i

To all whom t may concern:

Be it known that I, JAMES HEGGIE, a subject of the King of the UnitedKingdom of Great Britain and Ireland, and residing at Glydebank,Dumbartonshire, Scotland, have invented acertain new and usefulImprovement in Sewing-Machines', of which the following is aspecification.

This invention relates to improvements in sewing machines, particularlyglove sewing machines of the type fitted with an upright post forreceiving the looper spindle, for uniting by means of a pique seam theoverlapping edges of the body and the fourchettes, etc., and has for itsprimary object to provide a machine of this class which oii'ers greaterconvenience in use and in which the' stitch-forming operation iseffected silently, with greater precision and at higher speed thanheretofore.

In the accompanying drawings Figure 1 is an end elevation of a sewingmachine embodying the invention, the base of the machine frame beingshown in section; Figs. 1EL and 1b show details; Fig. 2 is an invertedplan of the machine base.

Referring to the drawings, a machine embodying the invention comprises aframe 1 hinged at 2 to one edge of a tray-like base 3, said base 3 beingformed integral with va receptacle 4 projecting from itsforward edgeadjacent to the stitch-forming mechanism, and adapted to receive a spool5. The said receptacle 4 is formed with a hinged lid 6 having adepending bracket 7 supporting a horizontal pin 8 on which the spool 5is mounted. v f

Mounted in the overhanging arm of the Vmachine frame 1 is the mainvdriving shaft 9 carrying at its rearward end the usual band wheel 10and serving to transmit through suitable connections verticalreciprocating movements to the needle bar 11 and lifting and feedingmovements to the presser bar 12. Y

.In the upright member 13 of the bracket arm is housed a vertical shaft14: which receives rotary movements from the main driving` shaft 9 andcarries at its lower end a crank disk 15 fitted with a crank pin 16 towhich isconnected one end of a pitman 17 the other end of which isconnected to a swinging looper driving arm 18 pivotally supported fromthe machine base and formed with a cam slot 19 entered by a cam.

'Specification of Letters Patent.

SINGER MANUFAC- j Patented Apr. 16, 1918.

Application filed April 13, 1915. VSerial No. 21,175.

followerV (roller20) carried by a crank 214 l on the looper spindle 22,so that on rotation of the main shaft 9 oscillatoryjmovements areimparted to the looper. The pitman'17 comprises a rod 17 whose oppositeends are threaded into the terminal pieces 17". and

held against turning relatively to said terminal pieces bysuitablelock-nuts 17.

As will be seen from the drawing, the cam-slot 19 is of curved form andis preferably convexed toward, although not necessarily directly toward,the pivot of the arm 18. As the arm18 is vibrated to-and-fro,substantially the central portion of camslot 19 crosses the axis of thelooper-spindle 22 carrying the crank 21 which extends. preferably in ageneral direction away from the pivot of the arm 18 and terminates inthe 4cam-follower 20. When .the arm 18 is at the extremity 0fits-movement the ends of the cam-slot 19 are preferably extended away`from the axis 0f the looper-spindle 22, as illustrated in Fig. 2.Starting at the position shown in Fig. 2, as the shaft 14 rotates, thearm 18 is moved to the right and first imparts a relatively rapidturning move-v ment to the looper-spindle 22. This movement is slowed upas the cam-follower 20 rounds the bend at substantially the centralportion of the cam-slot 19 and enters the lower end-portion of saidcam-slot which is nearly straight and substantially tangent to itscircular path of movement about the pivot of the arm 18. Therefore, whenthe cam-follower 20 reaches this portion of the cam-slot 19,thelooper-spindle will pause. In the reverse movement of the arm 18 theinitial pause of the looper-spindle l22 will be followed by anaccelerated motion as the cam-follower 2O rounds the bend in the camslotand enters the upper end-portion of said cam-slot, as will be obvious toVthose skilled in the art. Thus, the form of the cam slot- 19 is suchthat there are produced the pause and accelerated motion required forthe production of a perfect double-loop stitch with.v

lengthen or shorten the pitman 17 in a well known manner, after whichthe lock-nuts may be r'etightened. l

'lll he presser bar 12 reciprocates in a guide carried by a bracket 23pivoted at its upper.

end and forming a pendulum support for the presser bar, oscillatorymovements around a horizontal axis being imparted to the bracket.

rEhe presser foot 2/l, 25 is divided or split in the direction of thelength of said foot. lin order that the halves may be readily adjustedrelatively to one another so as to provide for the unequal thickness ofthe work due to the overlapping of the edges to be united, the forwardhalf, that is to say the accessible half 211, of the presser foot isfitted soas to be slidable vertically relatively to the rearward half 25to which it is connected by a screwV 26 passing through a slot in saidforward half and threaded into the presser bar 12. The forward half 24of the presser has an upward extension 27 having an aperture at itsupper extremity to receive an eccentric 28 mounted on a pin 29projecting from a block or collar fixed to the presser bar; fixed tosaid eccentric 28 is a disk 31 having perforations, serrations or thelike on its forward face adapted to cooperate with an index finger32tted to the pin 29. lt will be understood that the operator by rotatingthe disk 31 and therewith the eccentric 28 will adjust the forward half24C of the presser foot, the index 4iin 'er 32 enoaoino one oftheerforations E3 2D C for the like and serving to lock the disk 31 in anydesired position of adjustment.

The presser-foot mechanism described herein is not claimed since itforms the subject-matter of my divisional application Serial No.169,885, filed May 18, 1917.

While I have shown and described what l consider to be the preferredform of the invention, it is to be understood that the form ,andarrangement of the essentialV elements are susceptible of modificationwithin the scope of the invention.

1t is to be understood that all novel features of the presentimprovement as shown anddescribed herein are of my invention.

"I claim Y A y 1. 1n a sewing machine, in combinatioma rotating shaft, apivoted arm deriving oscillatory movements from said shaft, said armbeing formed with a curved cam-slot, a looper-spindle having itslongitudinal axis disposed substantially `in parallelism with the axisof oscillation of said arm, av crank on said spindle, and a followercarried by said crank and entering said cam-slot, said cam-slot havingan operative por-tion extending in a direction substantially tangent Itothejcircular path of movement `of, said "portion as determined by theloscillation of said arm.

2. ln a sewing machine, in combination, a rotating shaft, aneccentrically mounted member carried thereby,"a pivoted arm having acam-track, link connecting said arm to said eccentrically mountedmember, and aV looper-supportlng spindle having its longitudinal axisdisposed substantially in parallelism with the axis of oscillation. ofsaid pivoted arm and providedv with a crank-arm, said crank-arm having acam-follower en gaging said cam-track, said cam-track having apause-producing operative portion substantially tangent to the path ofkmovement of said portion as determined by the oscillation of said armand also having an operative portion extending linfa direction at anangle to said pause-producing portion.

8. ln a sewing machine, in combination, a rotating shaft, a pivoted armderiving oscillatory movements from'said shaft, said arm being formedwith a curved cam-track which is convexed toward the pivot of said arm,

a looper-spindle having its longitudinal axis disposed substantially inparallelism with the axis of oscillation of said arm, and a crank onsaid looper-spindle having a camfollower engaging said cam-track.

l. In a sewing machine, in combination, a rotating shaft, a pivotedlooper-driving ,arm deriving oscillatory movements-from said shaft, alooper-spindle, said arm being formed with a curved cam-track convexedtoward the pivot of said arm, said pivot being so positioned thatsubstantially the central portion of said cam-track is adapted to 100 beintersected by the axis of said looper- 'spindle when vibratedto-and-fro across said axis, and a crank on said looper-spindleextending in a general direction away from the pivot of said looperdriving arm and 105 having a cam-follower in engagement with saidcam-track.

5. ln a sewing machine, in combination, a rotating shaft, a looperdriving arm deriving oscillatory movements from said shaft, 110 alooper-spindle, said arm being formed with a curved cam-track whoseextremities are extended substantially directly away from the axis ofsaid looper-spindle when said arm is at one cf'its extreme positions,115 and a crank on said looper-spindle having a cam-follower engagingsaid cam-track.

6. ln a sewing machine, in combination, a rotating shaft,alooper-driving arm deriving oscillatory movements from said shaft, 120a looper-spindle, said arm being formed with a curved cam-track whoseextremities are extended 'substantially directly away from the axis ofsaid looper-spindle when said arm is at one of its extreme positions,125 and a crank on said looper-spindle having a cam-follower engagingsaid cam-track, said crank extending in a general direction away `fromthe pivot of said looper drivingarm.

7. A sewing machine having, in combina- '130 tion, a frame including anupright 'Worksupporting post, a looper-spindle extending pivoted armderiving oscillatory movements from said shaft, said arm being formedwith a curved cam-slot, a crank on said spindle, and a follower carriedby said crank and entering said eam-slot, said cam-slot having anoperative portion extending in a direction substantially tangent to thecircular Copies oi this patent may be obtained for ve lcents each, byaddressing the Commissioner Washington, D. C.

name to this speccation in the presence of tWo subscribing Witnesses. Y

JAMES HEGGIE.

Witnesses: l

HENRY MASON, DOUGLAS FAIRWEATHER.

o! Patents,

